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Code

atusb/fw/mac.c: remove queued_rx; buffer frames in the MCU instead

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queued_rx held a frame in the transceiver's receive buffer until we could
transfer it. This may cause frame loss if a new reception begins.

We now retrieve frames from the transceiver immediately and buffer them
in the MCU.
This commit is contained in:
Werner Almesberger 2013-07-24 07:57:35 -03:00
parent 6416fa8d0b
commit b73d5fc1af
1 changed files with 44 additions and 33 deletions
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77
atusb/fw/mac.c
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@ -22,15 +22,18 @@
#include "mac.h"
#define RX_BUFS 2
bool (*mac_irq)(void) = NULL;
static uint8_t rx_buf[MAX_PSDU+2]; /* PHDR+payload+LQ */
static uint8_t rx_buf[RX_BUFS][MAX_PSDU+2]; /* PHDR+payload+LQ */
static bool rx_in = 0, rx_out = 0;
static uint8_t tx_buf[MAX_PSDU];
static uint8_t tx_size = 0;
static bool txing = 0;
static bool queued_tx_ack = 0;
static bool queued_rx = 0;
static uint8_t next_seq, this_seq, queued_seq;
@ -62,27 +65,45 @@ static void reg_write(uint8_t reg, uint8_t value)
/* ----- Interrupt handling ------------------------------------------------ */
static void receive_frame(void);
static void rx_done(void *user);
static void tx_ack_done(void *user);
static void usb_next(void)
{
const uint8_t *buf;
if (rx_in != rx_out) {
buf = rx_buf[rx_out];
led(1);
usb_send(&eps[1], buf, buf[0]+2, rx_done, NULL);
}
if (queued_tx_ack) {
usb_send(&eps[1], &queued_seq, 1, tx_ack_done, NULL);
queued_tx_ack = 0;
}
}
static void tx_ack_done(void *user)
{
usb_next();
}
static void rx_done(void *user)
{
led(0);
if (queued_rx) {
receive_frame();
queued_rx = 0;
return;
}
if (queued_tx_ack) {
usb_send(&eps[1], &queued_seq, 1, rx_done, NULL);
queued_tx_ack = 0;
}
rx_out = (rx_out+1) & (RX_BUFS-1);
usb_next();
}
static void receive_frame(void)
{
uint8_t size, i;
uint8_t *buf;
spi_begin();
if (!(spi_io(AT86RF230_BUF_READ) & RX_CRC_VALID)) {
@ -95,20 +116,16 @@ static void receive_frame(void)
return;
}
rx_buf[0] = size;
buf = rx_buf[rx_in];
for (i = 0; i != size+1; i++)
rx_buf[i+1] = spi_recv();
buf[i+1] = spi_recv();
spi_end();
led(1);
usb_send(&eps[1], rx_buf, size+2, rx_done, NULL);
}
buf[0] = size;
rx_in = (rx_in+1) & (RX_BUFS-1);
static void flush_queued_rx(void)
{
if (queued_rx)
receive_frame();
queued_rx = 0;
if (eps[1].state == EP_IDLE)
usb_next();
}
@ -122,7 +139,7 @@ static bool handle_irq(void)
if (txing) {
if (eps[1].state == EP_IDLE) {
usb_send(&eps[1], &this_seq, 1, rx_done, NULL);
usb_send(&eps[1], &this_seq, 1, tx_ack_done, NULL);
} else {
queued_tx_ack = 1;
queued_seq = this_seq;
@ -131,13 +148,9 @@ static bool handle_irq(void)
return 1;
}
/* unlikely */
if (eps[1].state != EP_IDLE) {
queued_rx = 1;
return 1;
}
receive_frame();
/* likely */
if (eps[1].state == EP_IDLE || rx_in != rx_out)
receive_frame();
return 1;
}
@ -193,9 +206,7 @@ static void do_tx(void *user)
*/
reg_write(REG_TRX_STATE, TRX_CMD_FORCE_PLL_ON);
flush_queued_rx();
handle_irq();
queued_rx = 0;
spi_begin();
spi_send(AT86RF230_BUF_WRITE);
@ -233,7 +244,7 @@ void mac_reset(void)
mac_irq = NULL;
txing = 0;
queued_tx_ack = 0;
queued_rx = 0;
rx_in = rx_out = 0;
next_seq = this_seq = queued_seq = 0;
/* enable CRC and PHY_RSSI (with RX_CRC_VALID) in SPI status return */